143-37-3Relevant articles and documents
Development of two scalable syntheses of 4-amino-5-aminomethyl-2- methylpyrimidine: Key intermediate for vitamin b1
Zhao, Lei,Ma, Xiao-Dong,Chen, Fen-Er
, p. 57 - 60 (2012)
Two scalable processes for the synthesis of 4-amino-5-aminomethyl-2- methylpyrimidine (2) are described. In the first approach, the less expensive 2-cyanoacetamide was reacted with Vilsmeier reagent to afford enamine 18, followed by the condensation with acetamidine to produce the 4-amino-2-methylpyrimidine-5-carbonitrile (6); subsequent hydrogenation gave 2 in 65% overall yield. In the second approach, malononitrile was treated with the ionic salt 21, prepared in situ from DMF and dimethyl sulfate, to give 18, which, without isolation was reacted with acetamidine hydrochloride to afford the common intermediate 6. Overall yield of this approach was 70%. Both methods are performed in a convenient manner suitable for industrial use.
GABAERGIC RECEPTOR SUBTYPE SELECTIVE LIGANDS AND THEIR USES
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Page/Page column 26, (2012/12/13)
Described herein are α3 or α2 or α2/α3 GABAergic receptor subtype selective ligands, pharmaceutical compositions, and methods of use of such ligands and compositions in treatment of anxiety disorders, epilepsy and schizophrenia with reduced sedative and ataxic side effects. In embodiments, such as α3 or α2 or α2/α3 GABAergic receptor subtype selective ligands lack ester linkages and may be thus relatively insensitive to hydrolysis by esterases.
2-HYDROXY-1-OXO 1,2 DIHYDRO ISOQUINOLINE CHELATING AGENTS
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Page/Page column 112, (2010/11/28)
The invention provides a new class of strongly chelating multidentate ligands based on a 2-hydroxy-1-oxo-1,2-dihydro-isoquinoline-3-carboxylic acid scaffold (hereafter 1,2-HOIQO) in combination with polyamine backbones. The extremely stable bidentate 1,2- HOIQO moiety can be synthesized by standard synthetic methodology on a large scale. An advantageous feature is the possibility to introduce a wide range of substituents on the benzene ring by standard transformations (like electrophilic aromatic substitutions). This allows, for example, for the tuning of chemical, photophysical, and solubility properties, as well as the attachment of functional moieties, relevant for sensing and imaging applications (e.g. DNA, proteins, antibodies, fluorophores, etc.). The combination of the 1,2-HOIQO chelators with polyamine backbones provides very strongly binding ligands for a variety of metals including first-row transition metals, lanthanides, actinides, etc. Metal complexes of this kind are expected to be useful in a number of applications (e.g. luminescence, MRI, actinide sequestering, metal chelation therapy, metal radioisotope labeling, etc.).